Hard to believe it, but this is real. Famous ammonite, highly collectable. "Promicroceras planicosta"

These fossils found in northeastern China show the diversity and small sizes of some of the feathered dinosaurs. Many avian traits evolved in dinosaurs long before birds themselves appeared. Photograph by Robert Clark, Fossils from the Institute of Vertebrate Paleontology and Paleoanthropology, Beijing; Shandong